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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '744a8ef25d01752451e755420e9f764e456c9c13bd8f825ebcb148ad784292ed' 
  AND token = 'X3x0vdVHkUmTlbp9YoMXkcNeG09OKW6FiMbHj30vGm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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