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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8f3631a066b7724b3e943d220086161362586867a1c8d6be4e2aee409a0eee3' 
  AND token = 'OLVesb61/ESjPIidWWNlOjwfyPGVb/sfobXf2xc1oF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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