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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02e1d39d85a0b4d2a1bf7e35aa807ca0cc4a8719b6adcc659dd0ae280bb36ef9' 
  AND token = 'nYwqP9QBra9p4rto6/2+eMwldI36J1qHhSA9RHj1rsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}