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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12d39c18de995bc6ac757e586acd30bec38159b90c2d830c5d047919cdae062b' 
  AND token = 'Z1Uhh46F+M1PRSFQoVE17gMS7ux3EJc35OU2pQv7dWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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