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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c57a4edb81ad69029514a2473bba285da5cc17c7dc147c44252c4568f30cd537' 
  AND token = '1Ou3TIo9013aYqexKIt4DtnvFVF+DB6lTKBRZ+9PSu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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