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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3f5e9794cc239f1377f49cb3469205cc3fa33ad59318f74d8e23f46e2ebefef' 
  AND token = '6C1DJ6rsf6Fmffm2Z28tJ7NP2fpmaiufPgdEKg9T6So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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