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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63039afefc0932301cefaba250955270621cbbc46cc49af16ed6175b1e06a294' 
  AND token = 'i9kZ9ICUyv1gxWK7Rb67KLmtTuF18SaB6cT8rVbZ0Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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