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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f0dd87abf61007a8c1e6638973a95a0acc20074d6ff5506c444cef7a5a3b062' 
  AND token = '6wUnkLfik0bcv+sWGAW/wQ0+fEXseMdteTBr8MhfF68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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