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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daf37cdd5f0d3fe1345cbff9711ae9f88b3f99711beb4d187baf150adfc196b1' 
  AND token = 'y7rXJzQgANPf7UNvcqe+CsaMB2gDY9jRWZNcYunh7HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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