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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36858c5deff3bfd3bd8ada03e03e5ba3dbe9afc03f87ad0fbdbe2fc74e62c51e' 
  AND token = 'DsKbs5KHhjeP5UF5R9df48IGTWW3wLD8Lz/4mDCeakY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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