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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f19805b590f47f94ced8ec8b1eba0c576b0000e7ff156845c95c5cc752f0a7fe' 
  AND token = 'S8Il8njgXOONR8ooSxC7ZUHyFPzWdOhTr6Tlboy1OTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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