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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd71cf6a52496e833c9edb4c9bb9d4f40a551854afbff2a68de7962cae993640a' 
  AND token = 'jYme8qipOa2hI8R2ndHKboFh6XsMCLR3s7f+GgpmH3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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