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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dc84629602bb2ecd1c5899c567b0474da0dd0224d5d23499f28c286f8b3706a' 
  AND token = 'q5YgHbW/H5YE4y5XAWgMjoQLUyegO2dvnsq2LdLnEFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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