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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0eb5e62862da348a0b7a318c5a95f312f07ffb7d44f7b5f9a44801aafb76b583' 
  AND token = 'F8l/cnfCTjwnx3ICzbcPClQ6THfH649fQIHRoMN2U2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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