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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd377e52fd6b4edb6760c6c8e6d1674324d846c0046e0dd9bc8f7ac05bb17455' 
  AND token = 'cFgG81tnxhvojJSZv6cTA2PgyomWjTfjYYtrQpO1YZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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