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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '136cf8d350389e6f5fa309fbdd7c09ea43c3a9f000f68865df81e0f24c0d9470' 
  AND token = 'ESGO1kltCIVq4lmK+TAgdcOe0R3bTjvIsMZ9wUds79Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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