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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb4290613340c38e3b787bbff7a0f9f9ff12e334782ecc66bfdd44ef65304ea5' 
  AND token = 'l1x6Kduf/zCsS0PGrC2maZ0ljnVoa6oL3T9FfrhJA9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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